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Interlock Application - Rectifier Access

Scheme # 43A
To prevent opening any rectifier enclosure door while the rectifier is operating.

Simple rectifier scheme allowing doors to be opened in any order. Supervisory key required for initial operation of breaker interlock. Any quantity of rectifier access doors can be accommodated.

Breaker A is normally closed. Key A-1 is held in the L-O interlock on breaker A and supervisory key S-1 is retained by a supervisor. All A-2 keys are held in the transfer interlock. All rectifier enclosure access doors are locked closed.

To gain access to the rectifier enclosure, proceed as follows:

Reverse sequence to restore service.

Note: As an additional precaution, the Type D door interlocks can be supplied with auxiliary contacts wired to the breaker trip circuit.

Scheme # 25
Scheme # 26
Scheme # 27 Scheme # 28
Scheme # 29
Scheme # 30
Scheme # 31
Scheme # 32
Scheme # 33 Scheme # 34
Scheme # 35
Scheme # 35A
Scheme # 36